Chambering device for rock-drills.



W. WEBER.

CHAMBERING DEVICE FOR ROCK DRILLS.

APPLICATION FILED DEC. 30. |916.

Putentd Fh. 26, 1918` @72211971 far titi t: ib

CHAMBEJRIING DEVICE FOB, ROCK-DRILLS.

Specication of Letters Patent.

Patenten ren.. ao, iai..

Application filed December 30, 1916. Serial No. 139,757.

To all whom t may concern:

'Be it known that l, WILHELM WEBER, a citizen of the German Empire, and a resident of the town of Hayingen, in Lorraine, in the German Empire, have invented new and useful Improvements in Chambering Devices for Rock-Drills, of which the following is a specification.

rllhis invention relates to a chambering device adapted to be used in connection with rock drills its object' being to provide an improved chambering device which is especially designed to be used in connection with percussion drills and which can be readily introduced into, and withdrawn from, a

previously drilled hole.

The novel apparatus according to this invention, when applied for producing a chamber-like extension, is passed through the previously drilled hole on to the bottom of the latter and there set into operation in the same manner, and by the same means, used in conjunction with the drilling bit for the purpose of producing the bore hole that is to be enlarged at its bottom.

An embodiment of my invention is illustrated by way of example in the accompanying drawings, in which Figure l illustrates the manner of introducing and withdrawing the apparatus through the bore hole. Fig. 2 shows the apparatus according to this invention in its spreaded or operative position.

Like letters refer to like parts in both gures.

Referring to the drawings, a represents a tubular shaft which terminates at one end in a spindle portion c shaped to allow of attaching the same to a percussion drill apparatus instead ofthe drill bit, and at the other end in a block e in which there is provided a channel or bore hole e1 establishing communication between the interior of the tubular shaft a: and the interior of the bore hole. To the block c are movably secured two pairs of cutting members b which are pivotally jointed by means of two pivots b1 disposed in lateral alinement and two longitudinally alined pivots b2 and b3. rlhe pivot b2 is mounted upon, or integral with,.the said block e The joint b3 is shaped so as to engage the bottom of the bore hole with a spherical surface, the bottom of the bore hole acting as an abutment for the latter. |The cutting blades, at their outer edges, are provided with indentations or teeth for the purpose of breaking away or chipping the rock within the zone which is to be chambered.

At the upper end of the tubular shaft a is provided an air inlet al which is in communication with an air pipe h. IThis communication is shown to be established by means of an annularly channeled ring f and a sleeve g upon which the said ring f' is revoluble. rl`he sleeve g is liXedly secured upon the tubular shaft a and provided with a bore hole that registers with the said inlet d. As is shown in the drawings, the annularly channeled ring j can be kept in position upon the sleeve g by means of a set collar g1.

Compressed air is supplied through the pipe h and passes through the tubular shaft a and the channel el into the portion of the bore hole which is bein'g chambered and therein serves the purpose of blowing away the rocky chips produced by the revolving and percussively acting cutting blades b.

My novel tool is applied as follows:

The bore hole being produced by any suitable tool, preferably of the percussion type, the drill bit is removed and my novel chambering device attached to the drill operating apparatus by means of the spindle c. For the purpose of introducing the operative portion of the chambering device the eutting blades b are moved into the stretched position which is illustrated in Fig. l of the drawings. With the blades in this position the shaft asv can now be readily passed through the bore hole on to the bottom of the same. As soon as the joint b3 which has been described as having a spherical exterior shape strikes theI bottom of the bore hole the tool may be set into operation in the usual manner, while the revolving rock breaking structure composed of the cutting blades Z) is simultaneously subjected to percussive acn tion.

To remove the dust and rocky chips produced during the chambering operation, the pipe /1l is opened whereupon compressed air enters the bore hole through the passage el and clears out the dust and chips through the space between the walls of the bore hole and the shaft a.

llf a chamber of the desired size is obtained the tool is stopped and the chambering device can now be readily removed by simply withdrawing the tubular shaft a, the upper walls of the produced chamber causing the cutting blades to assume the stretched.

iro

position which enables them to pass through the bore hole.

What I claim and desire to secure by Letters Patent of the United States is:

l. In a device for the purpose described, the combination of a tubular stem closed at its upper end, a cutter head secured to and projecting below the lower end of the stem, said head lhaving a passage extending through it and communicating with the interior of the stem, two cutting blades pivotally connected to the lower end of the vcutter head, two additional cutting blades pivotally connected together and to the blades attached to the head, and means for supplying Huid to the tubular stem.

2. In a device for the purpose described, the combination of a tubular stem closed at its upper end, a tubular cutter head having a. portion secured within the lower end of the stem and a portion extending below the stem, two cutting blades pivotally connected with the cutter head and extending downwardly therefrom, two additional cutting blades pivotally connected at their upper ends with the first said blades and having their lower ends pivotally connected together, the outer edges of all of said blades being serrated, and means for supplying Huid to the tubular stem.

In testimony whereof I have hereunto affixed my signature.

'WILHELM WEBER. Witnesses:

JEAN GRUND, HARRY E. CARLSON. 

